NCAA Eligibilty after taking one year Post Graduate year in UK

Our son is thinking about taking a year out ( a PG year) in the UK before taking up an Athletic Scholarship in the USA. He will have finished his 2 year BTEC Extended Diploma in June 2016. He finished his GCSE’s in June 2014 and would plan another 1 year BTEC from September 2016 till June 2017. Can anyone tell me if he would be Red Shirted by NCAA for doing this. We are getting conflicting advice and the NCAA documents are not too clear ( to me) on this topic. All help gratefully received